.twinkling{
    @color : green;
     @-webkit-keyframes twinkling{
        0%{
            opacity:0; /*透明度为0*/
            color: @color;
        }
        50%{
            opacity:0.5; /*透明度为0*/
            color: lighten(@color, 25%);
        }
        100%{
            opacity:1; /*透明度为1*/
            color: lighten(@color, 50%);
        }
     }
     @-moz-keyframes twinkling{
        0%{
            opacity:0; /*透明度为0*/
            color: @color;
        }
        50%{
            opacity:0.5; /*透明度为0*/
            color: lighten(@color, 25%);
        }
        100%{
            opacity:1; /*透明度为1*/
            color: lighten(@color, 50%);
        }
     }
     @keyframes twinkling {
        0%{
            opacity:0; /*透明度为0*/
            color: @color;
        }
        50%{
            opacity:0.5; /*透明度为0*/
            color: lighten(@color, 25%);
        }
        100%{
            opacity:1; /*透明度为1*/
            color: lighten(@color, 50%);
        }
     }
}

.food{
    -webkit-animation: twinkling 1s infinite ease-in-out;
    -moz-animation: twinkling 1s infinite ease-in-out;
    animation: twinkling 1s infinite ease-in-out;
}

.map{
    margin: 50px 50px;
    overflow: hidden;
}